public abstract class Shape {
    public abstract void draw();
}

class Circle extends Shape{
    public void draw(){
        System.out.println("⚪");
    }
}

class Triangle extends Shape{
    public void draw(){
        System.out.println("🔺");
    }
}

class Star extends Shape{
    public void draw(){
        System.out.println("⭐");
    }
}
